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7.5.20.0. makeModElimRing
Procedure from library nctools.lib (see nctools_lib).
- Usage:
- makeModElimRing(L); L a list
- Return:
- ring
- Purpose:
- create a copy of a given ring equipped with the
elimination ordering for module components
(c,<)
- Note:
- usually the list argument contains a ring to work with
Example:
| | LIB "nctools.lib";
ring r1 = 0,(x,y,z),(C,Dp);
def r2 = makeModElimRing(r1); setring r2; r2; kill r2;
==> // coefficients: QQ
==> // number of vars : 3
==> // block 1 : ordering c
==> // block 2 : ordering Dp
==> // : names x y z
ring r3 = 0,(z,t),(wp(2,3),c);
def r2 = makeModElimRing(r3); setring r2; r2; kill r2;
==> // coefficients: QQ
==> // number of vars : 2
==> // block 1 : ordering c
==> // block 2 : ordering wp
==> // : names z t
==> // : weights 2 3
ring r4 = 0,(z,t,u,w),(a(1,2),C,wp(2,3,4,5));
def r2 = makeModElimRing(r4); setring r2; r2;
==> // coefficients: QQ
==> // number of vars : 4
==> // block 1 : ordering c
==> // block 2 : ordering a
==> // : names z t
==> // : weights 1 2
==> // block 3 : ordering wp
==> // : names z t u w
==> // : weights 2 3 4 5
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